If they are not a trader yes it won't have an impact to them but I think there are people who do both activities. They trade to earn and then they do gamble for fun but on top of that, they are still careful. In offline casinos yes, fiat money is the one that we will be using but I heard some real life casinos now allows cryptos. If crypto ATMs are possible then why not those machines? It can come handy because we might run out of physical cash.

For online casinos, it's also possible to use digital fiat other than cryptos but that is if you don't care about your privacy and you won't mind being tax wherever you make a win. Another thing that can discourage users is the games. We still have better games here in a crypto casino.